MPG to L/100km: Comparing Fuel Efficiency Globally

The Two Ways to Measure Efficiency

When you look at a car's fuel economy, you'll see one of two types of measurements: Miles Per Gallon (MPG) or Liters per 100 Kilometers (L/100km). The main difference is that MPG measures distance per fuel unit, while L/100km measures fuel consumed over a fixed distance.

The Conversion Challenge

Because one is a direct ratio and the other is inverse, you can't just multiply by a single number. Here are the formulas (using US Gallons):

To find L/100km: 235.215 ÷ MPG = L/100km
To find MPG: 235.215 ÷ L/100km = MPG

Efficiency Examples

30 MPG ≈ 7.84 L/100km
40 MPG ≈ 5.88 L/100km
50 MPG ≈ 4.70 L/100km

Lower vs. Higher Numbers

In the MPG system, a higher number is better (more distance on the same fuel). In the L/100km system, a lower number is better (less fuel used to travel 100km). This is a common point of confusion for international travelers renting cars abroad.

Conclusion

Understanding these fuel efficiency units helps you make informed decisions when buying a vehicle or planning a road trip budget. Use our fuel economy converter to instantly translate these values and see how much you'll spend at the pump.

Try our Fuel Economy Converter